a-a a-b aaa aab aak aan aar aas aay ab- aba abb abk abn abr abs aby aka akb akk akn akr aks an- ana anb ank ann anr ans any ar- ara arb ark arn arr ars ary as- asa asb ask asn asr ass asy ay- aya ayk ayn ayr ays baa bab bak ban bar bas bay bba bbb bbk bbn bbr bbs bby bka bkb bkk bkn bkr bks bna bnb bnk bnn bnr bns bra brb brk brn brr brs bry bsa bsb bsk bsn bsr bss bsy by- bya byk byn byr bys ka- kaa kab kak kan kar kas kay kba kbb kbk kbn kbr kbs kkb kkk kkn kkr kks kky kn- kna knk knn knr kra krk krn krr krs kry ksa ksb ksk ksn ksr kss kya kyn kyr kys naa nab nak nan nar nas nay nba nbb nbk nbn nbr nbs nka nkk nkn nkr nks nky nna nnb nnk nnn nns nra nrb nrk nrn nrr nrs nry nsa nsb nsk nsn nsr nss nsy nya nyk nyn nys nyy ra- raa rab rak ran rar ras ray rba rbb rbk rbn rbr rbs rkb rkk rks rky rna rnb rnn rnr rns rny rra rrb rrk rrn rrr rrs rsa rsb rsk rsn rsr rss ry- rya ryk ryn ryr rys ryy saa sab sak san sar sas say sba sbb sbk sbn sbr sbs sby sk- ska skb skk skr sks sky sna snb snk snn snr sns sny sr- sra srb srk srn srr srs sry ss- ssa ssb ssk ssn ssr sss sy- sya syb syk syn syr sys yaa yab yak yan yar yas yay ybr ybs yby yka ykk ykn yna ynk ynn yns yny yra yrn yrs ysa ysb ysk ysr yss ysy yyb yys yyy